This dose finding study uses a 3 + 3 dose escalation and expansion design to establish the recommended Phase 2 dose. The starting dose is CC-292 375 mg twice daily and Lenalidomide 10 mg once daily. After review of the data for dose limiting toxicities (DLTs), the second dose level will be enrolled. Doses for this second cohort are CC-292 500 mg twice daily and lenalidomide 10 mg once daily. Additional doses of lenalidomide in combination with CC-292 may be evaluated to accurately determine the maximum tolerated dose. Once the maximum tolerated dose and/or optimal biologic effect has been ascertained, an expansion cohort of 24 subjects may be enrolled.